Final answer:
Long-established political traditions were challenged during the time of "Jacksonian Democracy."
Step-by-step explanation:
Statement A: Suffrage was opened up to all citizens.
Statement B: It began an era of Republican dominance.
Statement C: The idea of the "common man" in politics was ended.
Statement D: Long-established political traditions were challenged.
Of these statements, the true statement regarding "Jacksonian Democracy" is Statement D. Long-established political traditions were challenged during the time of "Jacksonian Democracy."
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